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The nitrogen economy of winter wheat

Published online by Cambridge University Press:  27 March 2009

R. B. Austin ,
M. A. Ford ,
J. A. Edrich  and
R. D. Blackwell
R. B. Austin
Affiliation:
Plant Breeding Institute, Cambridge
M. A. Ford
Affiliation:
Plant Breeding Institute, Cambridge
J. A. Edrich
Affiliation:
Plant Breeding Institute, Cambridge
R. D. Blackwell
Affiliation:
Plant Breeding Institute, Cambridge
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Summary

In a field experiment with 47 wheat genotypes, plant samples were taken at anthesis and maturity and analysed for nitrogen. Taking means over all genotypes, the plants contained at anthesis 83 % of the total present at maturity, while at maturity 68 % of the plant nitrogen was present in the grain.

There was significant genetic variation in most of the component attributes determining nitrogen uptake. At anthesis, the heaviest plants contained most nitrogen. Because the nitrogen concentration in the leaves (average 2·8%) was much greater than in the stems and ears (average O8 %) and the leaves comprised, on average, 37 % of the plant weight at anthesis, variation in leanness was the main cause of variation in the nitrogen content of plants of a given weight. During grain filling, plants which lost the most dry weight from their stems and leaves took up the least nitrogen.

It is suggested that the strong positive correlation between the accumulation of dry matter and of nitrogen, both until anthesis and during grain filling, occurred because both carbon assimilation and nitrate reduction depend on energy made available from chloroplasts. In addition, assimilate is required to sustain the growth of roots which is necessary for continued nitrate uptake.

The results show that it should be easier for breeders to select for high nitrogen uptake from among heavy than from among light genotypes. However, although dwarf genotypes tended to be light, none of the correlations found was strong enough to render it impossible to produce dwarf genotypes capable of giving high yields of high-protein grain.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 88 , Issue 1 , February 1977 , pp. 159 - 167
Copyright
Copyright © Cambridge University Press 1977

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References

Austin, R. B. (1972). Diurnal changes in the sugar and organic anion concentrations in red beet leaves. Annals of Botany 36, 475–83.CrossRefGoogle Scholar
Austin, R. B. (1975). Report of the Plant Breeding Institute, Cambridge for 1974, 158–9.Google Scholar
Austin, R. B., Edrich, J. A., Ford, M. A. & Blackwell, R. D. (1976). Report of the Plant Breeding Institute, Cambridge for 1975, 140–1.Google Scholar
Austin, R. B. & Jones, H. G. (1975). Report of the Plant Breeding Institute, Cambridge for 1974, 20–73.Google Scholar
Church, B. M. (1976). Fertilizer use on farm crops in England and Wales, 1975. London: Ministry of Agriculture, Fisheries and Food (SS/SAF/21), 7 pp.Google Scholar
Ellen, J. & Spiertz, J. H. J. (1975). The influence of nitrogen and benlate on leaf area duration, grain growth and pattern of N-, P- and K·uptake of winter wheat (Triticum aestivum). Zeitschrift fur Acker und Pflanzenbau 141, 231–9.Google Scholar
Home-Grown Cereals Authority (1974). The Quality of Wheat and Barley from the 1974 Harvest. London: Home-Grown Cereals Authority.Google Scholar
Moneal, F. H., Berg, M. A., Brown, P. L. & Maguire, C. F. (1971). Productivity and quality response of five spring wheat genotypes, T. aestivum L., to nitrogen fertilizer. Agronomy Journal 63, 908–10.Google Scholar
McNeal, F. H., Berg, M. A. & Watson, C. A. (1966). Nitrogen and dry matter in five spring wheat varieties at successive stages of development Agronomy Journal 58, 605–8.CrossRefGoogle Scholar
Miflin, B. J. (1976). Potential for improvement of quantity and quality of plant proteins through scientific research. Fertilizer Use and Protein Production 53–74. Proceedings of the 11th Colloquium of the International Potash Institute, Renne-Bornholm, Denmark, 1975.Google Scholar
Ministry Of Agriculture, Fisheries & Food (1976). Output and utilisation of farm produce in the United Kingdom, 1969/70 to 1974/75. London: HMSO.Google Scholar
National Institute Of Agricultural Botany (1975). Recommended varieties of cereals. Farmers' Leaflet, No. 8.Google Scholar
Ryle, G. J. A., Cobby, J. M. & Powell, C. E. (1976). Synthetic and maintenance respiratory losses of 14CO2 in uniculm barley and maize. Annals of Botany 40, 571–86.CrossRefGoogle Scholar
Snedecor, G. W. (1956). Statistical Methods. Ames: Iowa State College Press.Google Scholar
Spbatt, E. D. & Gasser, J. K. R. (1970). Effects of fertiliser, nitrogen and water supply on distribution of dry matter ctnd nitrogen between the different parts of wheat. Canadian Journal of Plant Science 50, 613–25.Google Scholar
Welbank, P. J., Gibb, M. J., Taylor, P. J. & Williams, E. D. (1974). Root growth of cereal crops. Rothamsted Experimental Station Report for 1973, Part 2, 26–66.Google Scholar
Whitear, J. D. (1972). The nitrogen requirements of winter wheat varieties. AgTec, Spring 1972, 20–3 (pub. Fisons Ltd., Felixstowe, U.K.).Google Scholar